BIOCONTROL OF HETERODERA SCHACHTII BY PAECILOMYCES FUMOSOROSEUS ON SUGAR BEET

S. Fatemy

Abstract


The survival of Paecilomyces fumosoroseus in soil and its pathogenic effect on Heterodera schachtii were studied in laboratory, pot and microplot tests. The fungus multiplied in culture tubes more at 15 and 25 °C than at 30 °C. P. fumosoroseus applied as a wheat culture to soil in pot tests suppressed the nematode, but had no effect when applied as a spore suspension. The fungus applied with wheat also increased tap root weight of sugar beets. In the microplot experiment, nematode reproduction was greater and nematode population reduction by P. fumosoroseus was enhanced in steam sterilized soil, compared to natural soil. However, the fungus had no effect on plant growth. At the end of the experiments colony forming units were much reduced in number compared to the inoculum concentration, but were not affected by oxamyl.

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